scholarly journals Effect study of super-critical CO2 parameters on heat transfer performance of U-shaped double-pipe heat exchanger

2022 ◽  
Vol 30 ◽  
pp. 101762
Author(s):  
Gang Wang ◽  
Yonghui Li ◽  
Tieliu Jiang ◽  
Zeshao Chen
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Transfer Performance ◽  
Effect Study ◽  
Transfer Performance ◽  
Double Pipe ◽  
Pipe Heat

scholarly journals Heat Transfer Performance of EG-Water Based Fe3O4 and its Hybrid Nanofluids in a Double Pipe Heat Exchanger

2019 ◽  
Vol 8 (4) ◽  
pp. 5892-5898
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Base Fluid ◽  
Heat Transfer Performance ◽  
Hybrid Nanofluid ◽  
Transfer Performance ◽  
Overall Performance ◽  
Double Pipe ◽  
Pipe Heat ◽  
Better Than

Nanofluids have good potential in enhancing the heat transfer performance of conventional fluids. In the present paper, the heat transfer performance of Fe3O4 and its Hybrid mixture with Fe3O4 and SiC nanoparticles in the volume ratio of 50:50 in 20:80 Ethylene Glycol (EG) –Water as base fluid are determined experimentally and the results are compared with that of the base fluid. The volume concentration range of nanoparticles considered in the analysis is 0.01% to 0.08%. The experiment is carried under turbulent flow conditions with Reynolds number ranging from 5000 to 20000 in a Double Pipe Heat Exchanger (DPHE) with U-bend. Results indicate that the thermal conductivity of hybrid nanofluid is higher by 16.19% and its viscosity is lower by 11.6% compared to Fe3O4 /20:80 EG-Water nanofluid at an operating temperature of 45°C. The heat transfer coefficient and overall performance of hybrid nanofluid are better than Fe3O4 /20:80 EG-Water nanofluid. The overall performance of Hybrid nanofluid is 27.75% better than that of Fe3O4 /20:80 EG-Water nanofluid.

Simulation Study for Heat Transfer Performance of Spiral Flow Double-Pipe Heat Exchanger

2012 ◽  
Vol 550-553 ◽  
pp. 3024-3028
Author(s):  
Yi Ning Wang ◽  
Qun Hui Lu ◽  
Yang Yan Zheng ◽  
Biao Yuan
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Shear Force ◽  
Heat Transfer Performance ◽  
Engineering Application ◽  
Transfer Performance ◽  
Spiral Flow ◽  
Surface Shear ◽  
Double Pipe ◽  
Pipe Heat

In this article, simulation analysis has been performed for the flow and heat transfer performance of spiral flow double-pipe heat exchanger using finite volume method, respectively for the relationship between Nu and the average shear force on inner pipe outer wall at different turbulent flow Re with different radial offset of inlet and outlet pipes and different spacing of inlet and outlet pipes. The results show that, as compared with an ordinary double-pipe heat exchanger, in a spiral flow double-pipe heat exchanger, both inner pipe convective heat exchange coefficient and inner pipe wall surface shear force are lower, with the magnitude of reduction related to a number of factors such as radial offset of inlet and outlet pipes and Re. The study in this article has provided theoretical basis for further engineering application of spiral flow double-pipe heat exchangers.

Heat transfer performance of water and Nanoencapsulated n-nonadecane based Nanofluids in a double pipe heat exchanger

2017 ◽  
Vol 53 (12) ◽  
pp. 3399-3408 ◽  
Author(s):  
Semahat Doruk ◽  
Osman Nuri Şara ◽  
Ali Karaipekli ◽  
Sinan Yapıcı
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Transfer Performance ◽  
Transfer Performance ◽  
Double Pipe ◽  
Pipe Heat
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